Question

HELPPPPPPPPPPPPPPPPPPPPPPPPPPPPPPP!!!

Express the diagram in the form of a logic statement. [2]
P = ________________________
3. (a) Complete the truth table below for the logic circuit which is made up of NAND gates only.

Answer 1

Step-by-step explanation:

R = (AB)'. S = (AR)' = (A . (AB)')'

T = (B . (AB)' )' P = (ST)'

P = ( (A . (AB)')' . (B. (AB)')' )'

Let us simplify the formula for P.

P = (A . (AB)') + (B . (AB)' )

= (A . (A'+B') ) + (B . (A' + B') )

= A A' + A B' + B A' + B B'

= A B' + B A'

= A XOR B.

Truth table

A B R S T P

1 1 0 1 1 0

0 0 1 1 1 0

1 0 1 0 1 1

0 1 0 1 0 1

Answer 2

different or difference between Dot-matrix and Daisy-wheel printer